MD5 is an irreversible encryption algorithm, the full name is Message-Digest Algorithm 5.
MD5 is one of the hash algorithms widely used in the current computer field to ensure complete and consistent information transmission.
A typical application of MD5 is to generate a message digest for a piece of information to prevent tampering.
For example, many softwares under UNIX have a file with the same file name and the file extension .md5 when they are downloaded. There is usually only one line of text in this file, and the general structure is as follows:
MD5 (tanajiya.tar.gz) = 0ca175b9c0f726a831d895e269332461
This is the digital signature of the tanajiya.tar.gz file.
MD5 treats the entire file as a large text message, and produces this unique MD5 message digest through its irreversible string transformation algorithm.